Improvement in balanced slide-valves



Paranria JOHN J. DE LaNonvoFBmeHAMToN, NEW YORK.

IMPROVEMENT IN BALANCED SLIDE-VALVES.

Specification forming ea of Letters Patent No. "179,002, dated June 20, 1876; application filed To all whom it hwy-concern:

Be it known that I,-JO1IN J. DE LANOEY, of Binghamton, in the county of v Broome and State of New York, have invented a new anduseful Improvementin Anti-Friction Slide- Valves for- Steam-Engines, which improvement is fully set forth in the-following specification, reference being had to the accompanying drawings.

My invention r'elates'to that class of antifrictionvalves in which the upper surface of the valve works in steam-tight contact witha face-plate in the steam-chest, the object of the invention being the construction of a valve that shall be more effective and less liable to derangement than others now in use, and that, when required, shall facilitate the removal of the valve from the steam-chest.

My invention consists in a new construction and arrangement of parts, which will be-hereafter fully explained. I

Figure l in the accompanying drawings is a top view of a steam-chest embodying my invention. Fig. 2 is a plan of the same, with the chest-cover removed, showing the top of the face-plate inposition. Fig. 3 is a plan of the valve and connections in position with the face-plate removed, showing the projecting lugs upon which the plate is supported. Fig. 4 is the valve removed from the steam-chest, with the packing-bars removed, showing the springs in position, the manner of their connection, and the valve-port. Fig. 5 is a side elevation of the valve, having an outside section of the packing-grooves removed, showing one of the side springs and packing-bar in position, also the plainsurface of the side of the valve. Fig. 6 is an end view of the same, showing the end packing-bar and spring, and the manner of connecting the packing-bar. Fig. 7 is an inverted view of the face-plate. Fig. Sis one of the adjusting-bars removed. Fig. 9 represents one of the side packing-bars with thesprin g bearing at each end of the bar. Fig-.10 is the same with the spring bearing on its flattened center; for the purpose of showing that it may be used in either position.

A is the valve, which has a skeleton. top connected by transverse ribs a. This skeleton top obviates the usual pressure on the valve, with the exception of that required to main- April 24, 1876.

' I tain a steam -tight contact with the valve-seat when the port iscovered and. the cylinder full of steam. The sidesand ends of the valve have plain perpendicular surfaces, which allows it to be made broader and deeper than the ordinary valve, on account of the usual.

projecting face, by whichmeans a larger exhaust-cavity may be used; and whenit is rethe yoke, while, by the ordinary method, the

entire steam-chest has to be removed.

, The upper edges of the valve A have longi-,

tudinal and transverse grooves 12, for the pack ing-bars B, which are made square. This allows of a broader bearing on the face-platethan the ordinary rectangular or flattened bar, which is liable, by its unequal sides to catch against the sides of the grooves 11, by the pressure of the steam, and prevent its free movement, while a barhaving equal sides presents the same surface for the steam to act upon on each of its sides. These bars are connected by a square lap-joint, c, on each corner, the long bars supporting the short ones, which secures an equal bearing against the faceplate until worn out.' From the outside and center of each bar there is a projecting lug, d, which works in-the slot 0, made in the outside of the groove 1). These lugs carry the'bar separate and independent of the joints 0, which prevents the bar from changing its relative position with the face-plate, which obviates the usual wear at the points of contact. 0 O are elliptic platform-springs, which work in the grooves b, under the packing-bars B, and may have their bearings on the end of the bars or on aflattened surface, f, in the center, as shown by Figs. 9 and '10 in the drawings. The ends of these springs have slots g, which work astride safety-pins h in the corners of the valve. These pins enter a holein the endsof the long bars B, which prevents the escape of any part of the spring if it should break.

The two long springs are all that is required to keep the packing up, and the two short ones are simply for safety in case the long ones should break.

D is the face-plate, which is fitted closely in the steam-chest, with the exception of triangular openings iat each cornerforafree circnlationof steam in the chest has its bearing on four t) ojectiiig lugs, from the inside of the steam'chest, and takes the full pressure of thefvalvefby whiclfiiiea'iis" the usual attachment ,to th e che st-ggyer is ob viated, and a were satisfactory adjustifieriltf secured. Between these lugs and the faceplate are four j s i g-hers; wl t qh there projections 7' from nie'wo "{mdceh"ter, which 1 enter notches k in the face-plate, which holds i them securely in position. F

When the valve Wearsmr 1s faced down) the face-plate is adjusted to its position With l the valve by reducing the thickness of the, t F, a whe r hw-n a 01'1",the screws vii in t ewe to the required dista These screws also h when the morn-e 1 ifirs For oni nga- 'recess,"'1t, 1s platedirectlyundrfine oi recess the' 'oil passes thfi 'nghchann oil-holes ineach'of thefou 7 plate. It is fthenldistribiite packingbars when 'theyal'v'e is travel; and oiier' the short bars n" mission.

I am aware that packin g-bars simi some respects, to those deserinea as vention, have" long' heen v n I patent was granted" to G. :Rwh'a' an improved slid yalye'f dated"Jani1ary 31f, 1871, having widepackingbaisconn'e'ctedlhy abutting the ends ofthe g I a I the rfii drditsu eisn w king described in said invention, Qlill anyothersnnilar arrangement, and confin'e'lri'yselfto the construction and connection of t epaeg sinaher .B v t he other devices 'lierin fdFscriUedJ The-fac e diljalanci11g plate D is supported independently of the ordinary scre s i thssteam-qhesew allows of a "were acurate"ani1 ready'adjnstment of the packing than can be accomplished when suspended in the ordinary manner.

"Ilailn as new; and desire to secure by Let- ,ters Patent, is

1. The plane 0 fla tsides of the valve A, to l "tlid' 'steamjfchest',

we ta g-ba I g dworking in slot Qrojection face filate; oillsfo jjt oilm l constructed eindescrihed,

.D PAN E .l" i Witnesses PJ'P. ROGERS,

a d working indepenn- 

